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What is the maximum volume of 2.1 M NaOH(aq) that the buffer (pH=5.75) prepared from sodium acetate and 2.5 L of 0.55 M acetic acid

What is the maximum volume of 2.1 M NaOH(aq) that the buffer (pH=5.75) prepared from sodium acetate and 2.5 L of 0.55 M acetic acid can tolerate without showing a pH change greater than 0.25 units? pKa of acetic acid is 4.75.

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